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usb/xhci: release xhci->lock during turning on/off usb port's acpi power resource and checking the existence of port's power resource 

When setting usb port's acpi power resource, there will be some xhci hub requests.
This will cause dead lock since xhci->lock has been held before setting acpi power
resource in the xhci_hub_control(). The usb_acpi_power_manageable() function might
fall into sleep so release xhci->lock before invoking it.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Lan Tianyu 2012-10-15 15:38:34 +08:00 committed by Sarah Sharp
parent 3b6054da68
commit 170ed80734
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/xhci-hub.c
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@ -809,11 +809,13 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
temp = xhci_readl(xhci, port_array[wIndex]);
xhci_dbg(xhci, "set port power, actual port %d status = 0x%x\n", wIndex, temp);
spin_unlock_irqrestore(&xhci->lock, flags);
temp = usb_acpi_power_manageable(hcd->self.root_hub,
wIndex);
if (temp)
usb_acpi_set_power_state(hcd->self.root_hub,
wIndex, true);
spin_lock_irqsave(&xhci->lock, flags);
break;
case USB_PORT_FEAT_RESET:
temp = (temp | PORT_RESET);
@ -917,11 +919,13 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
xhci_writel(xhci, temp & ~PORT_POWER,
port_array[wIndex]);
spin_unlock_irqrestore(&xhci->lock, flags);
temp = usb_acpi_power_manageable(hcd->self.root_hub,
wIndex);
if (temp)
usb_acpi_set_power_state(hcd->self.root_hub,
wIndex, false);
spin_lock_irqsave(&xhci->lock, flags);
break;
default:
goto error;